#include <stdio.h>  
#include <unistd.h>/*#包含<unistd.h>*/
#include <stdlib.h>  
#include <errno.h>  
#include <arpa/inet.h>
#include <string.h>  
#include <sys/types.h>  
#include <netinet/in.h>  
#include <sys/socket.h>  
#include <sys/wait.h>  
#include <string.h>
#include <netdb.h>
#define SERVPORT 3333
#define MAXDATASIZE 100    /*每次最大数据传输量 */

int main(int argc, char *argv[])
{
    int sock_fd, recvbytes;
    char buf[MAXDATASIZE];
    struct hostent *host;
    struct sockaddr_in serv_addr;
	if(argc< 2) {
        fprintf(stderr,"Please enter the server's hostname!\n");
        exit(1);
    }
    if((host=gethostbyname(argv[1])) == NULL) {
        herror("gethostbyname出错！");
        exit(1);
    }
    if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket创建出错！");
        exit(1);
    }
    serv_addr.sin_family=AF_INET;
    serv_addr.sin_port=htons(SERVPORT);
    serv_addr.sin_addr = *((struct in_addr *)host->h_addr);
    bzero(&(serv_addr.sin_zero),8);
    if(connect(sock_fd, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr)) == -1) {
        perror("connect出错！");
        exit(1);
    }
    if((recvbytes=recv(sock_fd, buf, MAXDATASIZE, 0)) == -1) {
        perror("recv出错！");
        exit(1);
    }
    buf[recvbytes] = '\0';
    printf("Received: %s",buf);
    close(sock_fd);
}
